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EN 1.4557 (GX2CrNiMoCuN20-18-6) Cast Stainless Steel

EN 1.4557 stainless steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.4557 is the EN numeric designation for this material. GX2CrNiMoCuN20-18-6 is the EN chemical designation.

It has a moderately high ductility and a moderately high tensile strength among cast austenitic stainless steels.

The graph bars on the material properties cards below compare EN 1.4557 stainless steel to: cast austenitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

160

Elastic (Young's, Tensile) Modulus

200 GPa 30 x 106 psi

Elongation at Break

40 %

Fatigue Strength

260 MPa 37 x 103 psi

Impact Strength: V-Notched Charpy

56 J 41 ft-lb

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

560 MPa 81 x 103 psi

Tensile Strength: Yield (Proof)

300 MPa 43 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

420 °C 800 °F

Maximum Temperature: Mechanical

1090 °C 2000 °F

Melting Completion (Liquidus)

1460 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

5.6 kg CO2/kg material

Embodied Energy

76 MJ/kg 33 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

PREN (Pitting Resistance)

45

Resilience: Ultimate (Unit Rupture Work)

190 MJ/m3

Resilience: Unit (Modulus of Resilience)

210 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.4557 stainless steel is notable for containing a comparatively high amount of molybdenum (Mo) and including copper (Cu). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties. Copper is primarily used to improve resistance to acids.

Iron (Fe) 49.5 to 56.3
Chromium (Cr) 19.5 to 20.5
Nickel (Ni) 17.5 to 19.5
Molybdenum (Mo) 6.0 to 7.0
Copper (Cu) 0.5 to 1.0
Manganese (Mn) 0 to 1.2
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.18 to 0.24
Phosphorus (P) 0 to 0.030
Carbon (C) 0 to 0.020
Sulfur (S) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ISO 11972: Corrosion-resistant cast steels for general applications

EN 10283: Corrosion resistant steel castings

Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010